U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
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State directory

Iowa ZIP Codes

Complete postal directory, details, and geographic map for the State of Iowa.

State ZIP Code City County Area Codes
IA 52057 Manchester Delaware County 563
IA 52060 Maquoketa Jackson County 563
IA 52064 Miles Jackson County 563
IA 52065 New Vienna Dubuque County 563
IA 52066 North Buena Vista Clayton County 563, 608
IA 52068 Peosta Dubuque County 563
IA 52069 Preston Jackson County 563
IA 52070 Sabula Jackson County 563, 779, 815
IA 52071 Saint Donatus Jackson County 563
IA 52072 Saint Olaf Clayton County 563
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Geographic Map of Iowa

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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.